Anucleic acid is a
a. micromolecule.
b. macromolecule.
c. trait.
d. gene.

Drag each tile to the correct location. match each trait that an organism displays to a reproductive strategy.

Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.